284 
The American Geologist. 
April, 1894 
ited ai some period subse'quenl to the formation of a stage probably 
about the mi (Id 1 1' of or in the upper half of the Lower ( 'oa I -measures." 
The author is led to regrel thai so little lias been done on the trans- 
Mississippi coal Mora, but in case he continues bis work in this Held both 
he and science at large may yet rejoice that he found it a tabula rasa. 
Descripcao de uma forma nova de Trilobite, Lichas (Uralic/ias) ribeiroi, 
i>\ J.F.N. Delgado. (CommissaodosTrabalhosgeolog.de Portugal, 
1892, pp. 1-31, pis. 1-6.) 
Uralicltas ribeiroi is an enormous lichad with a prodigious caudal spine 
(a very unusual appendage in this group), obtained from the upper beds 
of the Lower Silurian in the basin of Vallongo. Portugal. The species 
does not widely differ in structure from Platymetopus except in the pres- 
ence of the pygidial spine. The various parts illustrated show that this 
gigantic trilobite attained a length of 560 mm. or about 22.7) inches: a 
size, however, probably equaled if not surpassed by the Terataspis 
grandis Hall, a lichad of the Upper Helderberg faunas. 
\iiti stir mi iimi nun Eurypterus <lu Rot7tliegendes de Bussaco (Portugal),' 
by W. de Lima. (Commun. da Commissao dos Trabalhos geolog. Tom 
ii. Fasc. ii. 1892.) 
Eurypterus douviUii, sp. now, is the only known representative of this 
genus from faunas so late as the Permian. This species is a small one. 
characterized by its broad cephalon and thorax, and slender abdomen, 
as well as by the greal prominence and posterior position of the ocelli. 
Age of tin Newark brownstone. By B. S. Lyman. (Proc. Amer. Phil. 
Sin'., \oi. :;:;. pp. 5-10. 1 s<>4. > 
Prom a few imperfect fossil plants, which have been obtained from 
the Newark. X. .).. brown sandstone and which seem to be similar to 
Carboniferous forms, the author concludes that there is reason to doubt 
the Mesozoic age of this rock. G. 
Report onthe Coal Measures of Blount Mountain. By A. M. Gibson. 
(Geological Survej of Alabama; 8vo., pp. 1-80, 1893.) 
This is a reporl of explorations conducted bytheSurvej in a prac- 
tically undeveloped coal region, which lies in Blount, St. ('lair and 
Etowah counties. Alabama. A number of detailed sections are given, 
which show that coal seams are quite abundant in this region, and it is 
slated that then' are eleven or twelve of these seams that are over 
three feet in thickness and that furnish coal of good quality. G. 
Further observations upon the occurrence of diamonds in meteorites. By 
(). W. HUNTINGTON. (Proc. Amer. Acad. Arts and Sciences, vol. '-"•). pp. 
'.'(>l ".'I 1. with two plates.) 
A considerable quantity of the Canon Diablo meteorite, from Arizona, 
was dissolved and the diamonds, which occur only in minute grains, 
were separated; among them were found a few small octahedrons. 
Some of I he material was used in cutting an ordinary diamond and did 
the work well. Prom the crystal form, the hardness and the chemical 
com posit ion t here is no reason to consider the diamonds of this meteor- 
ite as other than true diamonds. It is suggested that diamonds may 
